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No clue what size those are. The largest they had when my kids were little was a 6. My son was big for his age and started wearing that size around 18 months, too, and wore them until he started potty training at 2. At that time he went into a size large pull-up, wore them for a couple months and had to go to the Good-nights that are made for older boys that bedwet because the pull-ups were too small.
He's 8 now and still wears that same size. I'm still amazed he was ever that big as a toddler (at 18 months he was wearing 3T clothes). He's still tall but so freaking skinny now it's amazing.

i am not sure as to what you are referring to as jumbo size, The largest diaper I have seen is a size six and my 2 year old son has been wearing those for a couple of months now. He is like 35.5 in tall and 34 lbs. They fit his bum better than a size 5.